html, body {

    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;

}

header {

    position: absolute;
    width: 100%;
    height: 40px;
    line-height: 40px;
    text-align: center;
    color: white;
    z-index: 1000;

}

.view_source {

    position: fixed;
    height: 40px;
    width: 120px;
    bottom: 10px;
    right: 10px;
    font-size: 14px;
    color: #cccccc;
    background-color: #414141;
    border-radius: 2px;
    line-height: 40px;
    text-align: center;
    cursor: pointer;
    user-select: none;
    box-sizing: border-box;

}

.view_source:hover {

    color: #e5e5e5;
    background-color: #6e6e6e;

}

.view_source:active {

    border: 1px #727272 solid;

}

.view_source a {

    color: #ccc;
    text-decoration: none;

}

.view_source a:hover {

    color: #e5e5e5;

}